Oh yes, I have that set up. I am talking about vibration/hum from return pump.Welcome back man! I actually just sold my biocube but I got that sucker pretty quiet, not sure if any vendors here sell them but what I did, in the back I added the inTank 3 tier filtration and refugium add ins, and then they sell a flow ramp for $5 that makes the water go silent. I knew I shouldve kept them but I sold them with the tank. Also I know some people added flow directors onto the exit into the tank but I left that stock. Very quiet, if it got loud it meant filters were clogged or low water.